In 2006, an oddball group of bankers, traders and brokers from some of the largest financial institutions made a startling realization: Libor—the London interbank offered rate, which determines the interest rates on trillions in loans worldwide—was set daily by a small group of easily manipulated administrators, and that they could reap huge profits by nudging it fractions of a percent to suit their trading portfolios. Tom Hayes, a brilliant but troubled mathematician, became the lynchpin of a wild alliance that included a prickly French trader nicknamed “Gollum”; the broker “Abbo,” who liked to publicly strip naked when drinking; a nervous Kazakh chicken farmer known as “Derka Derka”; a broker known as “Village” (short for “Village Idiot”) who racked up huge expense account bills; an executive called “Clumpy” because of his patchwork hair loss; and a broker uncreatively nicknamed “Big Nose” who had once been a semi-professional boxer. This group generated incredible riches —until it a